[SYCL][XPTI][NFC] Unify stream type #19399
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Data type which identifies an XPTI stream wasn't uniformly the same, even within XPTI itself different APIs expected different data type as a stream identifier.
This PR introduces the
xpti::stream_id_t
type alias and uses it everywhere.Motivation for this PR is to address warnings produced by
-Wconversion
. We don't have that flag enabled yet, but it is a requirement per our SDL processes. It will be enabled in #19306